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Tracking high-frequency seismic source evolution: 2004 Mw 8.1 Macquarie event

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Created 20/01/2025

Updated 20/01/2025

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The 2004 Mw 8.1 event on 2004 December 23 near the Macquarie Ridge is a very large intraplate event that has been overshadowed by the Mw 9.3 Sumatra-Andaman event only three days later. We are able to track the progress of source evolution by estimating the progression of the points of energy emission, exploiting the good azimuthal distribution of available stations. The results indicate that this event ruptured on two nearby fault systems reactivating fossil fracture zones, with the second sub-event to the west triggered by the first. The total duration of high-frequency radiation is quite short, about 60 s, for such a large event. Much of the high-frequency radiation occurs on a fault sub-parallel to that inferred from long-period studies. This composite fault behaviour with displaced triggered failure appears to be a characteristic of large intraplate events in the oceans.

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Title Tracking high-frequency seismic source evolution: 2004 Mw 8.1 Macquarie event
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/5898b786-5386-4505-82da-c29ba6e4c94e
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage http://www.ga.gov.au/place-names/PlaceDetails.jsp?submit1=GA1
Data Portal data.gov.au

Data Source

This dataset was originally found on data.gov.au "Tracking high-frequency seismic source evolution: 2004 Mw 8.1 Macquarie event". Please visit the source to access the original metadata of the dataset:
https://devweb.dga.links.com.au/data/dataset/tracking-high-frequency-seismic-source-evolution-2004-mw-8-1-macquarie-event

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